I am getting some duck eggs that are crested. How hard are those to hatch?
Crested is a lethal gene - if both parents are crested, 25% of the ducklings will die in the shell.
The crest is caused by a hole in the skull. The blood vessels that feed the crest run directly through the hole from from the brain to the crest, so the crest is directly attached to the brain. So if it gets pulled on...
Also, the cresting and hole cause fat deposits in the skull and brain. This happens to over 82% of all crested ducks, and leads to problems such as:
- Incoordination (ataxia), which may appear as a tottering walk. If ducks fall on their backs, they aren't able right themselves.
- Erratic head movements (tremors)
- Abnormally small eyes
- Convulsions
- Twisted or crooked neck (torticollis)
- Abnormal changes in behavior
- Inability to stand
So it's not necessarily the incubation that causes the problems, it's the crest itself. It's why I won't breed crested ducks.